Great game, I found myself shouting KYAH everytime I killed someone because I pictured myself as some kind of kung fu master against a bunch of gun wielding agents or something.
Not sure why I did that, was in the moment :D
Still, I think you can strengthen this game with power ups, varied characters and some kind of indicator to when the enemies will fire. I found myself running around people waiting on them so I didn't die when I went for the strike.